package org.qu.util;

import java.security.Security;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;

public class ThreeDes {
	/**
	 * @param args在java中调用sun公司提供的3DES加密解密算法时
	 *            ，需要使 用到$JAVA_HOME/jre/lib/目录下如下的4个jar包： jce.jar
	 *            security/US_export_policy.jar security/local_policy.jar
	 *            ext/sunjce_provider.jar
	 */
	private static final String Algorithm = "DESede"; // 定义加密算法,可用
														// DES,DESede,Blowfish

	// keybyte为加密密钥，长度为24字节
	// src为被加密的数据缓冲区（源）
	public static byte[] encryptMode(byte[] keybyte, byte[] src) {
		try {
			// 生成密钥
			SecretKey deskey = new SecretKeySpec(keybyte, Algorithm);
			// 加密
			Cipher c1 = Cipher.getInstance(Algorithm);
			c1.init(Cipher.ENCRYPT_MODE, deskey);
			return c1.doFinal(src);// 在单一方面的加密或解密
		} catch (java.security.NoSuchAlgorithmException e1) {
			// TODO: handle exception
			e1.printStackTrace();
		} catch (javax.crypto.NoSuchPaddingException e2) {
			e2.printStackTrace();
		} catch (java.lang.Exception e3) {
			e3.printStackTrace();
		}
		return null;
	}

	// keybyte为加密密钥，长度为24字节
	// src为加密后的缓冲区
	public static byte[] decryptMode(byte[] keybyte, byte[] src) {
		try {
			// 生成密钥
			SecretKey deskey = new SecretKeySpec(keybyte, Algorithm);
			// 解密
			Cipher c1 = Cipher.getInstance(Algorithm);
			c1.init(Cipher.DECRYPT_MODE, deskey);
			return c1.doFinal(src);
		} catch (java.security.NoSuchAlgorithmException e1) {
			// TODO: handle exception
			e1.printStackTrace();
		} catch (javax.crypto.NoSuchPaddingException e2) {
			e2.printStackTrace();
		} catch (java.lang.Exception e3) {
			e3.printStackTrace();
		}
		return null;
	}

	// 转换成十六进制字符串
	public static String byte2Hex(byte[] b) {
		String hs = "";
		String stmp = "";
		for (int n = 0; n < b.length; n++) {
			stmp = (java.lang.Integer.toHexString(b[n] & 0XFF));
			if (stmp.length() == 1) {
				hs = hs + "0" + stmp;
			} else {
				hs = hs + stmp;
			}
			if (n < b.length - 1)
				hs = hs + ":";
		}
		return hs.toUpperCase();
	}

	
	 public static void main(String[] args) {
		  // TODO Auto-generated method stub
		  //添加新安全算法,如果用JCE就要把它添加进去
		  Security.addProvider(new com.sun.crypto.provider.SunJCE());
		  final byte[] keyBytes = {0x11, 0x22, 0x4F, 0x58,
		  (byte)0x88, 0x10, 0x40, 0x38, 0x28, 0x25, 0x79,0x51,
		  (byte)0xCB,
		  (byte)0xDD, 0x55, 0x66, 0x77, 0x29, 0x74,
		  (byte)0x98, 0x30, 0x40, 0x36,
		  (byte)0xE2
		  }; //24字节的密钥
		  String szSrc = "This is a 3DES test. 测试";
		  System.out.println("加密前的字符串:" + szSrc);
		  byte[] encoded = encryptMode(keyBytes,szSrc.getBytes());
		  System.out.println("加密后的字符串:" + new String(encoded));
		  byte[] srcBytes = decryptMode(keyBytes,encoded);
		  System.out.println("解密后的字符串:" + (new String(srcBytes)));
		  }

	 
	 /**
	  * 加密
	  * @param str
	  * @return
	  */
	public String getEncrypt(String str) {
		final byte[] keyBytes = {0x11, 0x22, 0x4F, 0x58,
				  (byte)0x88, 0x10, 0x40, 0x38, 0x28, 0x25, 0x79,0x51,
				  (byte)0xCB,
				  (byte)0xDD, 0x55, 0x66, 0x77, 0x29, 0x74,
				  (byte)0x98, 0x30, 0x40, 0x36,
				  (byte)0xE2};
		byte[] encoded=encryptMode(keyBytes,str.getBytes());
		
		return new String(encoded);
	}
	/**
	 * 解密
	 * @param str
	 * @return
	 */
	public String getDeciphering(byte[] str){
		final byte[] keyBytes = {0x11, 0x22, 0x4F, 0x58,
				  (byte)0x88, 0x10, 0x40, 0x38, 0x28, 0x25, 0x79,0x51,
				  (byte)0xCB,
				  (byte)0xDD, 0x55, 0x66, 0x77, 0x29, 0x74,
				  (byte)0x98, 0x30, 0x40, 0x36,
				  (byte)0xE2};
		 byte[] srcBytes = decryptMode(keyBytes,str);
		 
		 return new String(srcBytes);
	}

}
